To add to this I think it would be really great if we could select each of the brokers we use in the position and strategy mode (sonar) tools. So we click on the trade which shows up on Sonar (or the one we draw out with the position tool), then there's a 'select broker button' somewhere which stays as the last broker used, then it also updates our account balance as well for each broker so the lot sizes adjust seamlessly.

(I'm going to add this as another suggestion)